Writing instrument cap



FIG. 1 is a rear elevational view of a writing instrument cap showing mynew design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top, left front perspective view thereof.

The ornamental design for a writing instrument cap, as shown anddescribed.